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An aquarium tank can hold 5400 liters of water. There are two pipes that can be used to fill the tank. The first pipe alone can fill the tank in 90 minutes. The second pipe can fill the tank in 60 minutes by itself. When both pipes are working together, how long does it take them to fill the tank?

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  1. 9 July, 05:07
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    36 minutes when both pipes are working together

    Step-by-step explanation:

    capacity of tank = 5400 liters

    Pipe A flow per mint. = 5400/90 = 60 liters per mint.

    Pipe B flow per mint. = 5400/60 = 90 liters per mint.

    Flow of A + B per mint. 60 + 90 = 150 liter per mint.

    Therefore, 5400 / 150 = 36 minutes to fill the tank
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